From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 2/9] ext4: Use pr_fmt and pr_<level>
Date: Tue, 20 Mar 2012 03:10:01 -0400 (EDT)
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From: Valdis.Kletnieks@vt.edu
Date: Tue, 20 Mar 2012 01:46:06 -0400

> OK. Say I'm a scraper.  How do I distinguish between:
> 
> pr_info("foo");
> printk(KERN_INFO "foo");
> 
> Oh my. seems that both result in exactly the same thing ending up in the
> dmesg buffer

No it doesn't result in the same output, read the definitions again.

pr_info can be influenced by pr_fmt, plain printk cannot